Transmitting apparatus.



J. J. COMER.

TRANSMITTING APPARATUS. APPLICATION FILED FEB. 24. 1914;

Patented Dec. 19,1916.

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TRANSMITTING APPARATUS.

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' J..CO1VIER,,OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTD MATIC ENUNCIATOR COMPANY, OFCHICAGO, ILLINOIS, A GORPOBATION (BF-ILLINOIS.

TRANSMITTING APPARATUS.

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Patented Dec. 19, 1.9 16.

Application filed February 24;, 1914. =Seria1No. 820,692.

' To all whom it may concern Be it known that 1, JOHN J. Conan, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new anduseful Impro 'ement in Transmitting Apparatus, of which the following is a specification.

My invention relates to transmitting app a itus which is particularly adapted for use in" connection with loud speaking systems. It is, also especially adapted for transmitting voices or sounds in chorus from other sources.

In. my invention'I make use of the general thereisno increase in voltagealthough there 1s an increase 111 rolume; Where the transnntters areconnected in series it is found that renter the number "in seriesthe worsev transmission. In tact it may-be said that a single transmitter gives better ti ic results than a dot transmitters in series.

JGenerally stated,.the object of my invention isto providea'highly efficient transmitter-system in which di'derent centers or combination of centers may be used for a single source of sound, and these centers or combination oft centers can-be brought together for thepurpose, ofblendingall of the sounds in a common circuit.

TllGlHQflIlS foraccomplishing the foregoing and other-useful ends are hereinafter set forth and claimed.

:Referring to theydrawingfliigure 1 shows a series oftransmission centers'or units associated with a singleline. Fig. 2 is amodification ofit'ne same. 3 showsa line provided with a series of reproduc'ers of any suitable .type i as, for example, the type shownin BritishPatent 21892 of 1911. Fig. 4c is an adaptation ot'my apparatus to wire less telephony. Fig. 5 shows a plurality of units "in a main circuit and divided into groups.

Referring to Fig. 1, it will be seen that one transmission center comprises battery B, and differential microphone 2 divided into two sections 3"and 4 by the central diaphragm 5. The same center also comprises two branches, one containing the resistance 6 and the other the resistance 7. The second one 01 the centers contains the diiferential microphone 8 and two branches, one containing the resistance 9 and the other the resistance 10. This center is supplied by the battery 13. It will be observed that these two centers which are supplied by the battery B and B, have a side 11 in common. The third center comprises the transmitter 12, batteryB and the resistances 13 and 1 1. Tue third center has a side 15 in common with the centercontaining battery 13. All of these centers, it will be seen, are connected with. a line 16. Now any sound which will affect the central member 5, for example of the center containing the battery B, will cause the diaphragm 5 to vary the resistance in the sides-3 and 4. By this varying resistonce a variation of potential originating in the battery B is made to occur in the line 1.6. T he same istrue in -reard to each of the other centers with regard to its own battery. Obviously, therefore, it aseparatc source of sound ismadeto uii ect each of the microphones 2, 8 and 12 separately in the line 16, there will occur a variation of potential which will be resultant ofall of the variations. There is no limit to the number of centers which can-be connected up in this manner and whenever it is necessary or desirab'le, one source of sound can be caused to affect one or more ofthe centers, and another source of sound can be caused to affect one ormore additional centers.

In my invention it is feasible to combine any number ofcenters too tain on the line wiich is common to them all an algebraic result of all the voltages due to the variations of potentialin the centers.

Referring to Fig. 2, it will be seen that it is the same as Fig. 1, with the exception that in the place of the center controlled by the battery B a differential microphone 17 hasbeen substituted'for resistances, such as the resistances 6' and 7 in the center cons trolled by the battery B. A similar change has been made in each of the other centers controlled by the batteries 13 and B Either of the circuits shown in Fig. 1 and Fig. 2 may be connected to the amplified circuit shown. in Fig. 3, that is, line 16 may be connected to the line 18 or theline 19'm'ay be connected to the line 18. Similarly either of the lines 16 or 19 can be connected to the line 20 in Fig. 4t for wireless transmission. In this Fig. 4- there is shown at 21 an arc light and associated with this are light a source of energy at 22. In series with this source of energy there is the secondary winding 23 of the induction coil, the primary 2% of which is connected with the transmitter circuit, as already explained. The are light 21 is shunted by the condenser 25 and inductance 26. In series with this condenser and inductance is a primary winding 27 for affecting the aerial 28.

Fig. 5 shows the main line having conductors 31 and 32 terminating in an instrument 36, which may be a repeater or wireless apparatus. It shows a plurality of units G, E, In, G, H, divided into groups, such as C D, E F, and G H, and a source of sound for each group indicated at I, J, K, which sources may be of any kind. It will be seen, therefore, that when the diaphragm, such as the diaphragm 5, is normal, that is, when it is adjusted so that the ratio of the resistances in the arms stand so that resistance 45 is to 6 as 3 is to 7, there is no difference in voltage between the points 29 and 30. Further, it will appear that the diaphragm can be made of such a weight that the first impact of sound will carryit over to one side and unbalance the terminals and keep them unbalanced, the diaphragm continuing to operate, causing vibrations in the line but not passing through zero. The voltage on the line which is connected permanently to the normall y neutral points will be above zero during the vibrations. It may be noted in this connection that by permanent connection is meant that the connection is not to such a variable member as the member 5.

'I'Vhat I claim as my invention is:

1. In an. electrical system, a plurality of units consisting each of a Vi heatstone bridge having battery permanently connected at the juncture of two of the arms and terminating at the juncture of the other two arms in a movable element, a separate source of wave energy for each element in each unit for operating the element associated therewith to disturb the potential at the other two junctures of the other two arms in each unit, said bridges connected in series.

2. In an electrical system, a unit having a multiple circuit, a battery bridged across the sides of said multiple circuit dividing element operable by wave energy to disturb the balance of the voltage at said points of juncture, each unit thereby impressing cor responding potential variations to the main circuit, thereby producing a variationin the main circuit equal to the algebraic sum of the individual variations of the units.

3. In an electrical system, a unit having a multiple circuit, a battery bridged across the sides of said multiple circuit dividing the-multiple circuit into two divisions, a

point in each division at the point of juncture of the two branches of the multiple,

said point normally of the same potential, a plurality of such units in one group, a plurality of such groups, a main circuit, said units connected in series in said main circuit using said points of normal potential .as terminals, one termlnal oi the battery in each unit terminating in a movable element ,operable by wave energy to disturb the balance of the voltage at the said points of juncture, each unit thereby impressing the corresponding potential variations on the main circuit, aseparate so'urce of wave en ergy for each group of units for afiecting all of the variable elements similarly, thereby impressing upon the main circuit the arithmetic sum of all the variations in the group and the several groups impressing upon the main circuit the algebraic sum of the variations produced by each group.

4. I11 an electrical system, a plurality of units consisting each of aIVheatstone bridge having battery connected at the juncture of two of the arms and terminating at the juncture of the other two arms in a movable element, a separate source of wave energy for each element in each unit for operating the element associated therewith to disturb the potential at the other two junctures of the other two arms in each unit, a main circuit terminating atsaid terminals and an electrical reproducer or repeater on said line for receiving and responding to the algebraic sum of said variations;

5. In an electrical system, a unit having a multiple circuit, a battery bridged across the sides of said multiple circuit dividing the multiple circuit into two divisions, a point in each division at the point of juncture of the two branches of the multiple, said points normally of the same potential, a plurality of such units, a: main circuit,

said units connected in series in the main circuit using said points of normal potential as terminals, thebattery in each unit terminating in a connection on one side of the bridge andterminating in the other side in to the main circuit, thereby producing a variation in the main circuit equal to the algebraic sum of the lndividual variations of the units, and an electrical reproducer or repeater on said line for receiving and re .sponding to said varlations.

6. In an electrical system, a unit having a multiple circuit, a battery bridged across the sides of said multiple circuit dividing the multiple circuit into two divisions, a

point in each division at the point of juncture of the two branches of the multiple, said point normally ofthe same potential, a plurality of such units in one group, a

plurality of such groups, a main circuit, said units connectedin series in said main circuit using said points of normal potential asterminals, the battery in each unit terminating in a connection on one side of the bridge and terminating in the other side in a movable element operable by wave of energy to disturb the balance of the voltage at the said points of juncture, each unit thereby impressing the corresponding potential variations on the main circuit, a separate source of wave energy for each group of units for aflecting all of the variable elements similarly, thereby impressing upon the main circuit the arithmetic sum of all the variations in the group and the several groups impressing upon the mainv circuit the algebraic sum of the variations produced by each group, and an electrical reproducer or repeater on said line for receiving and responding to said variations.

7. In an' electrical system a unit consisting of a IVheatstone bridge having the battery connected at the juncture of two of the arms and'terminating at the juncture of the other two arms in amovable element, a plurality of such units in a group-,a plurality of such groups, a main circuit, said units connected in series in said main circuit, using the re-' maining'juncture points of the arms as terminals, a separate source of'wave energy for each group of units for affecting all the variable elements similarly, thereby impressing upon the main circuit the arithmetic sum of. all the variations in the group and the several groups impressing upon themain circuit the algebraic sum of the variations produced by the separategroups.

8. In an electrical system a unit consisting of a Wheatstone bridge having the battery connected at the juncture of two of the arms and terminating at the juncture of the other two arms in a movable element, a plurality of such unlts in a group, a plurality of such groups, a main circuit, said units connected in series in said main circuit, using the remaining juncture points of the arms as terminals, a separate source of wave energy for each group of units for affecting all the variable elements similarly, thereby impressing upon the main circuit the arithmetic sum of all the variations in the group and the several groups impressing upon the main circuit the algebraic sum of the variations produced by the separate groups, and an electrical reproducer or repeater 011 said line for receiving and responding to the algebraic sum of said variations.

9. In an electrical system a unit comprising a circuit with a battery and terminals, said battery connected in a balanced condition to deliver normally no voltage at said terminals, one of the terminals of said battery terminating in a sound movable element so adjusted that the sound waves in moving said element produce at said termi na ls corresponding potential variations, a plurality of such. units, a main circuit, said units connected in series in said circuit, thereby impressing in] the circuit resultant variations from all said units, a second main circuit, a source or" electric energy in said circuit, said first and second circuits located within the influence of each other so that the variations in the first circuit affect the energy inthe second main circuit.

10. In an electrical systema unit comprising'a circuit with a battery and terminals, said battery connected in a balanced condition to deliver normally no voltage at said terminals, one of the terminals of said battery terminating in a sound movable element so adjusted that the sound waves in moving said element produce at said terminals corresponding potential variatioi'is, above and below the point of zero voltage, a plurality of such units, a main cricuit, said units connected in series in said circuit thereby impressing in the circuit resultant valuations from all said units, a second main circuit, a source of electric energy in said circuit, said first and second circuits located within the influence of each other so that the variations in the first circuit affect the energy in the second main circuit.

11. In an electricalsystem a unit comprising a circuit with a. battery and terminals, said battery connected in a balanced condition to deliver normally no voltage at said terminals, one of the terminals of said battery terminating in a sound movable element so adjusted that the sound waves in moving said element produce at said terminals corresponding potential variations, a plurality of such units, a main circuit, said. units connected in series in said circuit, thereby impressing iu the circuit resultant variations of all said units, a second main circuit, a source of electric energy in said circuit, said first and second circuits located within the influence of each other so that the variations in the first circuit affect the energy in the second main circuit, a third circuit electrically related to the second circuit to receive energy from the second, said third circuit affected due to the relation of the three main circuits by the variations in the first main circuit.

12. In an electrical system a unit comprising a circuit with a battery and terminals, said battery connected in a balanced condition to deliver normally in voltage at said terminals, one of the terminals of said bat tery terminating in a sound movable element so adjusted that the sound waves in moving said element produce at said terminals corresponding potential variations, above and below the point of zero voltage, a plurality of such units, a main circuit, said units connected in series in said circuit, thereby impressingin the circuit resultant variations of all said units, a second main circuit, a source of electric energy in said circuit, said first and second circuits located within the influence of each other so that the variations in the first circuit ailect the energy in the second main circuit, a third circuit, electrically related to the second circuit to receive energy from the second, said third circuit aitected due to the relation of the third main circuit by the variations in the first main circuit.

13. In an electrical system a unit comprising a circuit, a battery and terminals, said battery connected in a balanced condition to deliver normally no voltage at said terminals, one of the terminals of said battery terminating in a sound movable element so adjusted that the sound waves in moving said element produce at said terminals corresponding potential variations, a plurality of such units, a main circuit, said units connected in series in said circuit, thereby impressing in the circuit resultant variations of all said units, a transmission circuit for wireless transmission of energy, said line associated with said transmission circuit and influenced thereby for the Wireless transmission of the variations corresponding to the variations in said line circuit.

14. In an electrical system, a plurality of units consisting each or" a lVheatstone bridge having battery connected at the juncture of two of the arms and terminating at the j unc ture of the other two arms in a movable element, a separate source of wave energy for each element in each unit for operating the element associated therewith to disturb the potential at the other two junctures of the other two arms in each unit, a main circuit terminating at said terminals and an electrical reproducer or repeater 011 said line for receiving and responding to the algebraic sum of said variations, and a receiver responsive to said reproducer.

15. In an electrical system, a main circuit, a plurality of Wheatstone bridges connected across said circuit in series, a microphone in one of the limbs of each VVheatstone bridge, a separate source of current for supplying each VVheatstone bridge, and an electrical instrument in said main circuit responsive to the combined action of all of said microfor said line responsive to all of said microphones. V

18. In an electrical. system, a main circuit, a plurality of lVheatstone bridges connected across said circuit in series, a microphone in one of the limbs of each VVheatstone bridge, a source of current for supplying the bridges, an electrical instrument in said main circuit responsive to the combined action of all of said microphones.

19. In an electrical system, a main circuit, a plurality of VVhcatstone bridges connected across said circuit in series, a microphone in one of the limbs of each Whea-tstone bridge,

separate source of current for supplying each IVheatstone bridge, a repeater in said main circuit responsive to the combined action of all of said microphones 20; In an electrical system, a main circuit, a plurality of W'heatstone bridges connected across said circuit in series. a microphone in one of the limbs of each /Vhcatstonc bridge, a source of current for supplying the bridges, a repeater in said main circuit responsive to the combined action of all of said microphones. 1 r

21. In an electrical system, a main circuit, a plurality of VVheatstone bridges connected in series across said circuit, a plurality of microphones for each /Vheatstone bridge inserted in the limbs thereof, a source of current for supplying the bridges, and an electrical instrument for said line responsive to all of said microphones.

22. In an electrical system, a main circuit, a plurality of lVheatstone bridges connected in series across said circuit, a plurality of microphones for each Wheatstone bridge inserted in the limbs thereof, a separate source of current supply for each bridge, and a repeater for said line responsive to all of said microphones.

23. In an electrical system, a main circuit,

= a plurality of Wheatstone bridges connected in series across said circuit, a plurality of microphones for each WVheatstone bridge inserted in the limbs thereof, a source of current for supplying the bridges, and a repeater for said line responsive to all of said microphones. V

24:. In an electrical system, a main circuit, a plurality of lNheatstone bridges connected in series across said circuit, a differential microphone connected in the limbs of each bridge, a source of current for supplying the bridges, and an electrical instrument for said line responsive to all of said microphones.

25. In an electrical system, a main circuit,

a plurality of VVheatstone bridges connected in series across said circuit, a difierential microphone connected in the limbs of each bridge, a separate section of current supply for each bridge, and a repeater for said line responsive to' all of said microphones.

26. In an electrical system, a main circuit, a plurality of Wheatstone bridges connected in series across said circuit, a differential microphone connected in the limbs of each bridge, a source of current for supplying the bridges, and a repeater for said line responve to all of said microphones.

Signed by me at Chicago, Illinois, this 20th day of February, 1914.

JOHN J. COMER. Vitnesses R. BILLERBEGK, B. GARBER.

flopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

